US8145152B2 - Gain temperature compensation circuit - Google Patents
Gain temperature compensation circuit Download PDFInfo
- Publication number
- US8145152B2 US8145152B2 US12/342,433 US34243308A US8145152B2 US 8145152 B2 US8145152 B2 US 8145152B2 US 34243308 A US34243308 A US 34243308A US 8145152 B2 US8145152 B2 US 8145152B2
- Authority
- US
- United States
- Prior art keywords
- port
- signal
- thermistor
- temperature compensation
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
Links
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
- H03G1/0041—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using thermistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/02—Remote control of amplification, tone, or bandwidth
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H5/00—One-port networks comprising only passive electrical elements as network components
- H03H5/02—One-port networks comprising only passive electrical elements as network components without voltage- or current-dependent elements
- H03H5/10—One-port networks comprising only passive electrical elements as network components without voltage- or current-dependent elements comprising at least one element with prescribed temperature coefficient
Abstract
A gain temperature compensation circuit producing a relatively small loss of power, and enabling modification of a variation width of the attenuation amount in a predetermined temperature range is provided. A gain temperature compensation circuit includes a circulator and a thermistor. The circulator outputs a signal being input to a first port to a second port, and outputs the signal being input to the second port to a third port. The thermistor being connected to the second port reflects the signal being output from the second port by varying the power of the signal according to temperature, so as to input to the second port, in order to adjust the attenuation amount of the signal.
Description
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2008-133906, filed on May 22, 2008, the entire contents of which are incorporated herein by reference.
The present invention relates to a gain temperature compensation circuit varying a signal gain according to temperature, which is particularly appropriate for adjusting a signal gain to be input to a high output amplifier of a radio transmission apparatus.
For example, in a radio communication system, a radio transmission apparatus for transmitting a radio signal amplifies a high frequency signal by a high output amplifier (power amplifier), so as to transmit from an antenna. The power amplifier has a gain characteristic which varies with temperature, and is decreased as the temperature becomes high. Therefore, in order to maintain a constant signal gain irrespective of a thermal change, the signal gain being input to the power amplifier is adjusted by a gain temperature compensation circuit, and thereby temperature compensation is performed.
The following patent document 1 describes a method for compensating the temperature characteristic of a solid amplifier by varying the reference voltage of an error amplifier according to a varied resistance value of a thermistor.
[Patent document 1] The official gazette of the Japanese Unexamined Patent Publication No. Sho-53-113459.
However, in the conventional gain temperature compensation circuit, when it is intended to secure a constant amount (10 dB, for example) of a variation width (thermal inclination) of the attenuation amount (gain) in a predetermined temperature range, there is a problem that the attenuation amount at a normal temperature (in the vicinity of 25° C.) becomes relatively large, and accordingly, a large loss of power is produced. For example, in FIG. 1B , the attenuation amount at the normal temperature (in the vicinity of 25° C.) becomes on the order of approximately 10 dB, and also, a minimum attenuation amount (at 100° C.) becomes approximately 6 dB.
Further, since the conventional gain temperature compensation circuit is integrated into a chip, if it is desired to modify the thermal inclination of the attenuation amount in a predetermined temperature range, it is necessary to change the overall components in the gain temperature compensation circuit.
There is a known means for controlling the attenuation amount by voltage control. However, because the voltage control according to temperature is required, there are defects that the circuit becomes large in scale, and that a power supply for the control becomes necessary.
Accordingly, it is an object of the present invention to provide a gain temperature compensation circuit producing a relatively small loss of power, and enabling modification of a variation width of the attenuation amount in a predetermined temperature range.
To achieve the above-described object, a gain temperature compensation circuit includes: a circulator outputting a signal being input to a first port to a second port, and outputting the signal being input to the second port to a third port; and a thermistor being connected to the second port, and reflecting the signal being output from the second port by varying the power of the signal according to temperature, so as to input to the second port.
By utilizing the reflection of power produced by the thermistor when the impedance of the thermistor does not match the impedance of a signal transmission line, the power reflection of a signal being input to the circulator is varied with temperature. Thus, the attenuation amount of the signal power output from the circulator is adjusted.
The present gain temperature compensation circuit can suppress the attenuation amount itself while maintaining the variation width of the attenuation amount in a predetermined temperature range, and can reduce the loss (dead loss) of the signal power.
By varying the constant of the thermistor and the impedance of the fixed resistor connected in series or in parallel with the thermistor, it is possible to adjust the thermal inclination to an arbitrary value in the predetermined temperature range.
Additional objects and advantages of the invention (embodiment) will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Hereinafter, an embodiment of to the present invention will be now explained with reference to accompanying drawings. However, it is not restrictive of technical scope of the invention.
At this time, if the impedance of the transmission line of a high frequency signal does not match the impedance of the thermistor, the signal being input to the first port P1 and output from the second port P2 is reflected by thermistor 22. Using the above characteristic, gain temperature compensation circuit 20 varies the attenuation amount of the high frequency signal caused by a varied impedance of thermistor 22 according to a temperature change. The reflected high frequency signal is input to the second port P2, and output from the third port P3. By this, it is possible to vary the attenuation amount of the high frequency signal passing through circulator 21 on the transmission line.
Therefore, using thermistor 22 of which impedance varies in an area including the smallest attenuation amount in a predetermined temperature range, as shown by the encircled area in FIG. 3 , the thermal inclination of the predetermined attenuation amount in the predetermined temperature range can be secured, and the attenuation amount in the predetermined temperature range can be suppressed to be small.
Also, by modifying the impedance of fixed resistor 23 and the B constant of thermistor 22, it is easily possible to vary to a desired thermal inclination, and therefore, it is possible to flexibly cope with a specification change. Further, it is possible to realize with a simple circuit configuration, without need of a power supply and complicated control.
Because of a suppressed power loss using the present gain temperature compensation circuit, the gain in the power amplifier can be suppressed by that amount. This enables the reduction of transistor circuit components, and simplifies the configuration of the power amplifier.
The signal being DPD processed by distortion compensation section 4 is input to a D/A converter 5, and after I-signals and Q-signals are converted to an analog baseband signal, the output is made to an orthogonal modulator 6. Orthogonal modulator 6 performs multiplication and addition to the input I-signals and Q-signals by signals phase shifted by 90° from the reference carrier wave fed from a reference carrier wave generation section 7, so as to perform orthogonal modulation and output. A frequency converter 8 converts to a radio frequency by mixing the orthogonal modulation signal with a local oscillator signal, and outputs to a gain temperature compensation circuit 20.
Gain temperature compensation circuit 20 performs gain compensation on the transmission signal using the aforementioned function, and outputs the transmission signal to a power amplifier (PA) 9. Power amplifier 9 performs power amplification of the transmission signal, so as to output through an antenna 10. Also, the transmission signal is looped back in the apparatus. After being converted to an IF signal through a frequency converter 11 and an orthogonal detector 12, and passed through an A/D converter 13, the signal is fed back to distortion compensation section 4 as a feedback signal.
All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the principles of the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although the embodiment of the present invention has been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.
Claims (3)
1. A gain temperature compensation circuit comprising:
a circulator outputting a signal being input to a first port to a second port, and outputting the signal being input to the second port to a third port; and
a thermistor being connected to the second port, and reflecting the signal being output from the second port by varying the power of the signal according to temperature, so as to input to the second port.
2. The gain temperature compensation circuit according to claim 1 , further comprising:
a resistance element being connected in series or in parallel with the thermistor.
3. A radio transmission apparatus for transmitting a radio signal, comprising:
a signal generation section for generating a radio signal;
a gain temperature compensation section attenuating radio signal power generated by the signal generation section according to temperature; and
a power amplifier amplifying the radio signal having the power attenuated by the gain temperature compensation section,
the gain temperature compensation section comprising:
a circulator outputting a signal being input to a first port to a second port, and outputting the signal being input to the second port to a third port; and
a thermistor being connected to the second port, and reflecting the signal being output from the second port by varying the power of the signal according to temperature, so as to input to the second port.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008133906A JP2009284192A (en) | 2008-05-22 | 2008-05-22 | Gain temperature compensation circuit |
JP2008-133906 | 2008-05-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20090291651A1 US20090291651A1 (en) | 2009-11-26 |
US8145152B2 true US8145152B2 (en) | 2012-03-27 |
Family
ID=40636686
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/342,433 Expired - Fee Related US8145152B2 (en) | 2008-05-22 | 2008-12-23 | Gain temperature compensation circuit |
Country Status (3)
Country | Link |
---|---|
US (1) | US8145152B2 (en) |
EP (1) | EP2124330A1 (en) |
JP (1) | JP2009284192A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120045997A1 (en) * | 2010-08-20 | 2012-02-23 | Microelectronics Technology Inc. | Radio Frequency Transceiver |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8737940B1 (en) * | 2013-02-28 | 2014-05-27 | Intel Mobile Communications GmbH | Envelope tracking system and method for calibrating a supply voltage of an envelope tracking power amplifier |
US9680422B2 (en) * | 2013-03-27 | 2017-06-13 | Qualcomm Incorporated | Power amplifier signal compensation |
CN110311631B (en) * | 2019-05-29 | 2023-06-27 | 上海联影医疗科技股份有限公司 | Radio frequency power amplifier, radio frequency power amplifying method and magnetic resonance imaging system |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4034313A (en) | 1974-05-20 | 1977-07-05 | U.S. Philips Corporation | Microstrip gunn oscillator with varactor tuning |
JPS53113459A (en) | 1977-03-15 | 1978-10-03 | Nippon Telegr & Teleph Corp <Ntt> | Compensating method of temperature performance for solidstate amplifier |
US5659253A (en) * | 1994-11-17 | 1997-08-19 | Lucent Technologies Inc. | Temperature compensated radio frequency detector circuit |
US5701595A (en) * | 1995-05-04 | 1997-12-23 | Nippondenso Co., Ltd. | Half duplex RF transceiver having low transmit path signal loss |
JPH10341112A (en) | 1997-06-06 | 1998-12-22 | Mitsubishi Electric Corp | Phase modulator |
JP2000031746A (en) | 1998-07-14 | 2000-01-28 | Mitsubishi Electric Corp | Temperature-compensated amplifier |
US6374087B1 (en) * | 1997-12-23 | 2002-04-16 | U.S. Philips Corporation | Selective peak limiter with a circulator having a third branch having band-pass filter, a threshold element and an adapted load in series |
US6472949B1 (en) * | 1999-11-12 | 2002-10-29 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Signal attenuators |
US6693394B1 (en) * | 2002-01-25 | 2004-02-17 | Yazaki North America, Inc. | Brightness compensation for LED lighting based on ambient temperature |
EP1432121A1 (en) | 2002-12-19 | 2004-06-23 | Digital Multimedia Technologies | Temperature compensated amplifer circuit |
US20050170794A1 (en) | 2004-01-30 | 2005-08-04 | Eero Koukkari | Adjusting circuit |
US7068985B2 (en) * | 2003-05-19 | 2006-06-27 | Sony Ericsson Mobile Communication Ab | Radio transmitters with temperature compensated power control profiles and methods of operating same |
JP2007192699A (en) | 2006-01-20 | 2007-08-02 | Nec Corp | Temperature sensor and temperature sensor system |
-
2008
- 2008-05-22 JP JP2008133906A patent/JP2009284192A/en active Pending
- 2008-12-22 EP EP08172638A patent/EP2124330A1/en not_active Withdrawn
- 2008-12-23 US US12/342,433 patent/US8145152B2/en not_active Expired - Fee Related
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4034313A (en) | 1974-05-20 | 1977-07-05 | U.S. Philips Corporation | Microstrip gunn oscillator with varactor tuning |
JPS53113459A (en) | 1977-03-15 | 1978-10-03 | Nippon Telegr & Teleph Corp <Ntt> | Compensating method of temperature performance for solidstate amplifier |
US5659253A (en) * | 1994-11-17 | 1997-08-19 | Lucent Technologies Inc. | Temperature compensated radio frequency detector circuit |
US5701595A (en) * | 1995-05-04 | 1997-12-23 | Nippondenso Co., Ltd. | Half duplex RF transceiver having low transmit path signal loss |
JPH10341112A (en) | 1997-06-06 | 1998-12-22 | Mitsubishi Electric Corp | Phase modulator |
US6374087B1 (en) * | 1997-12-23 | 2002-04-16 | U.S. Philips Corporation | Selective peak limiter with a circulator having a third branch having band-pass filter, a threshold element and an adapted load in series |
JP2000031746A (en) | 1998-07-14 | 2000-01-28 | Mitsubishi Electric Corp | Temperature-compensated amplifier |
US6472949B1 (en) * | 1999-11-12 | 2002-10-29 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Signal attenuators |
US6693394B1 (en) * | 2002-01-25 | 2004-02-17 | Yazaki North America, Inc. | Brightness compensation for LED lighting based on ambient temperature |
EP1432121A1 (en) | 2002-12-19 | 2004-06-23 | Digital Multimedia Technologies | Temperature compensated amplifer circuit |
US7068985B2 (en) * | 2003-05-19 | 2006-06-27 | Sony Ericsson Mobile Communication Ab | Radio transmitters with temperature compensated power control profiles and methods of operating same |
US20050170794A1 (en) | 2004-01-30 | 2005-08-04 | Eero Koukkari | Adjusting circuit |
JP2007520129A (en) | 2004-01-30 | 2007-07-19 | ノキア コーポレイション | Adjustment circuit |
JP2007192699A (en) | 2006-01-20 | 2007-08-02 | Nec Corp | Temperature sensor and temperature sensor system |
Non-Patent Citations (2)
Title |
---|
European Search Report dated Jun. 8, 2009, from the corresponding European Application. |
Notification of Reason for Rejection dated Dec. 6, from the corresponding Japanese Application No. 2008-133906, with partial English translation attached. |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120045997A1 (en) * | 2010-08-20 | 2012-02-23 | Microelectronics Technology Inc. | Radio Frequency Transceiver |
US8422969B2 (en) * | 2010-08-20 | 2013-04-16 | Microelectronics Technology Inc. | Radio frequency transceiver |
Also Published As
Publication number | Publication date |
---|---|
EP2124330A1 (en) | 2009-11-25 |
JP2009284192A (en) | 2009-12-03 |
US20090291651A1 (en) | 2009-11-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5266906A (en) | Linear amplifier performing distortion compensation control | |
US9590664B2 (en) | Method to improve active antenna system performance in the presence of mutual coupling | |
US6240144B1 (en) | Apparatus and method of linearizing a power amplifier in a mobile radio communication system | |
EP2128997B1 (en) | Distortion compensating apparatus, wireless communication apparatus, and distortion compensating method | |
US7529524B1 (en) | Adaptive power amplifier linearization in time division duplex communication systems | |
US8391806B2 (en) | Wireless communications device with an adjustable impedance matching network and associated methods | |
US20020034260A1 (en) | Adaptive predistortion transmitter | |
US8417194B2 (en) | Compensation device applied to power amplifier, method for determining pre-distortion of power amplifier, and method for compensating linearity of power amplifier thereof | |
JP2017535164A (en) | Intermodulation distortion canceller for use in multicarrier transmitters. | |
US20050026573A1 (en) | Transmitting apparatus and method of mobile communication terminal | |
US8145152B2 (en) | Gain temperature compensation circuit | |
US20200067466A1 (en) | Wireless Architectures and Digital Pre-Distortion (DPD) Techniques Using Closed Loop Feedback for Phased Array Transmitters | |
US9331652B2 (en) | Auto gain adjusting device and method thereof | |
JP4230272B2 (en) | Distortion compensation device | |
EP3192194B1 (en) | Method and apparatus for facilitating antenna calibration and transceiver | |
JP4700623B2 (en) | Electronic circuit | |
US9793932B2 (en) | Systems and methods for a predistortion linearizer with frequency compensation | |
US7728665B2 (en) | Distortion compensation apparatus and method | |
KR20000035116A (en) | Distortion compensation circuit | |
US9088472B1 (en) | System for compensating for I/Q impairments in wireless communication system | |
JP2007288545A (en) | Predistortion compensation circuit | |
US10862438B1 (en) | Feed-forward power amplifier with offline tuning capability | |
JP2008028746A (en) | Distortion compensating device | |
JP2010011370A (en) | Distortion compensation amplifier | |
JP2003243995A (en) | Method for controlling power and transmitter |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FUJITSU LIMITED, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TAKAHASHI, KIYOTAKA;SEINO, YASUSHI;REEL/FRAME:022021/0554 Effective date: 20081201 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20160327 |